Rock-drill



G. H. GILNIAN.

ROCK DRILL. APPLICATION FILED MAR. 2| v194. RENEWED N OV. 19,1920.;

Patented June 28, 1921.

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UNITED STATES PATENT OFFICE.

' GEORGE H. GILMAN, 0F BOSTON, MASSACHUSETTS, ASSIGNOR T0 SULLIVAN MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

ROCK-DRILL.

Specification of Letters Patent.

Patented June 28, 1921.

Application filed March 2, 1914, Serial No. 821,885. Renewed November 19, 1920. Serial No. 425,167.

`To all whom t may conce/m:

Be it known that I, GEORGE H. GILMAN, a citizen of the United States, and a resident of Boston, Suffolk county, Massachusetts, have invented an Improvement in Rock- Drills, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

`This invention relates to rock drills, and more particularly, though not exclusively, to means for supplying pressure Huid and water to the drilled hole to lay the dust and expel the cuttings therefrom while drilling the holes.

My invention will be best understood by reference to the following specification, when taken in connection with the accompanying drawings of one illustrative embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings:

Figure 1 is a central, longitudinal sectional view of a rock drill embodying my invention; and Y Fig. 2 is a detail longitudinal sectional view, on an enlarged scale, of some of the partsshown in Fig. 1, and illustrating the construction of the ejector and the mounting of the fluid supply tube.

Referring to the drawings, and to thef ernbodiment of my invention which I have selected for illustrative purposes, I have there shown a rock drill comprising a cylinder 3, within which a piston 4 reciprocates, under the control of a controlling valve 5, which may be of any usual or desired construction unnecessary here to describe except to say that it works in a valve casing 6 having a constant pressure fluid supply port 7.

- The rock drill may bel of either the reciprocating type orhammer type, within the spirit and scope of my invention, but in the present instance, I1 have selected for illustration a tool of the hammer type, in which the piston is provided with a reduced forward extension 8, constituting` a hammer bar adapted to deliver a rapid succession of blows upon the inner end of a drill-bit 9, having an axial perforation 10, through which fluid may be delivered to the cutting end of the drill-bit, as hereinafter described. The drill-bit is herein loosely, though nonrotatably, mounted in the drill-chuck 11, the latter being rotatably mounted in an elongated front cylinder head 12. A step-by-step rotativeV movement may be imparted to the chuck by any appropriate rotating mechanism 13, as, for example, that which forms the subiect matter of Patent No. 1,034,010, dated July 30, 1912, and issued to the Sullivan Machinery Company as my assignee.

A rear cylinder head or head block 14, which, if desired, may be provided with a handle or handles 15, is herein provided with a pressure fluid chamber 16, and a liquid supply chamber 17. The chamber 16 is herein connected by a passage 18 to the constant pressure space 7, so that when the usualy throttle valve is opened, pressure fluid is supplied to the chamber 16.

The chamber 17 in practice is connected to a suitable water supply, which may or may not be under pressure. It is deemed unnecessary to show the water tank, but I have herein shown a water supply hose 19, having a coupling 20 connected to a water supply nipple21, the latter being threaded into the rear cylinder head.

Passing. loosely through an axial perforation 22 in the piston is a fluid supply tube 23, which extends at its forward end into the perforation 10 in the drill-bit 9 so vas to conduct to the latter the desired supply of pressure fluid and water. This tube is supported at its rear. end in the rear cylinder head 14, and to that end the latter is herein provided with a bushing 25, threaded into the head and seated at its rear end against a suitable washer or gasket 26, which serves to prevent leakage of liuid along the threads of the bushing. In accordance with certain aspects of the invention, the tube may be otherwise suitably mounted in the bushing, but preferably, and in accordance with another feature of the invention, said bushing is provided with an'aXialchaInber 27, to receive two bodies of packing, or washers, 28 and 29, between which there is interposed a flange 30, whichmay be secured to the tube 23 in any appropriate manner. In the present instance, the latter is provided with a reduced portion 31, forming a shoulder 32, and the flange 30 is provided with a head or boss 33. This seats at one end against the shoulder 32, and is lirmly held thereagainst by beading the rear end of the tube outwardly to form a flange 34, thus firmly uniting the flange 30 and tube 23, so that they constitute a single piece.

virtually As a means for compressing the packing washers 28 and 29 to prevent leakage about the tube, and to prevent the latter from moving axially, I have herein provided a combined gland and throat piece 35 threadedy into the chamber 27 and engaging the packingv 28. ,This gland is herein provided with an axial passage 36, constituting the throat of anejector having a nozzle 37 threaded into the rear end of the gland. This nozzle vhas an axial passage 38, communicating with the kpressure fluid chamber 16, and is provided with a reduced and preferably conical forward extremity 39, which extends through an annular chamber l0, the latter communicating by one or more radial passages 11 with an annular chamber 42 encircling the bushing 25 and communicating with the water supply chamber 17 through a port or passage 13;

The arrangement of the parts just described is such that, if the -water supply -hose 19 be placed in a tank or bucket below the level of .thetool, the pressure fluid supplied to the ejector will serve to cause the latter to produce a sufficient suction to draw rthe water from the source of supply into and through the throat 36 and into the tube 23, where it is mingled with the actuating stream of pressure fluid from the nozzle 37,

and is discharged from the forward end of the tube into the hollow'drill-bit, whence it is conducted to the bottom of the drilled hole. The water serves to lay the dust and cleanse the hole, while the pressure fluid serves to eject the cuttings. Without any change in the construction of the tool or its connections, water under pressure may be used by simply connecting the water hose 19 to an appropriate supply of water under pressure. l

It will now be evident that I have provided a simple, convenient and effective means for supplying water, whether or not under pressure, as well as pressure fluid, to the hollowT drill-bit to lay the dust and eject the cuttings from the drilled hole; and that the construction is such that the water tube and its mountings, together with the ejector, may be very conveniently removed for repair or replacement by simply removing the rear cylinder head and unscrewing the bushing25, after which the parts contained in the bushing may be readily removed therefrom by unscrewing the gland 35. The threaded engagement of the nozzle 37 with the gland 35 also permits such longitudinal adjustment of said nozzle with respect to the throat 36 as may be necessary or desirable. The construction issuch that there is no possibility of any water working into thecylinder with the chances of injury to he latter,`which would be likely in many constructions heretofore.

While I have hereinshown and described vfluid supply tube extending into the axial one specific embodiment of my invention for illustrative purposes, and have disclosed and discussed in detail the construction and arrangement incidental to one specific application thereof, it is to be understood that the invention is limited neither to the mere details or relative arrangement of parts, nor to its specific embodiment herein shown, but that extensive deviations from the illustrated form or embodiment of the invention may be made, without departing from the principles thereof.

Having thus described my invention, what I claim and desire by Letters Patent' to procure is 1. In a rock drill, the combination of a cylinder, an axially perforated piston working therein, a rear cylinder head having pressure fluid and liquid supply passages, a

perforation of the piston,l a bushing in which said tube is supported, said bushing being mounted in said cylinder head, and an ejector also supported in said bushing for delivering a commingled supply of pressure fluid Vand liquid into the supply tube.

2. In a rock drill, the combination of a cylinder, an axially perforated piston working therein, a rear cylinder head having pressure fluid and liquid supply passages, a fluid supply tube extending into the axial perforation of the piston, a bushing in which Said tube is supported, said bushing being mounted in said cylinder head and having an axial chamber, packing in said chamber about said tube, a gland for compressing said packing, said gland having an axial passage communicating with said liquid supply passage, and an ejector nozzle communicating with said pressure .fluid supply passage and extending into said axial chamber.

3. In a rock drill,-the combination of a cylinder, an axially perforated piston working therein, a rear cylinder head having pressure fluid and liquid supply passages, a fluid supply tube extending into the axial perforation of the piston, a bushing in which said tube is supported, said bushing being mounted in said cylinder head and having an axial chamber, packing means to prevent ii 5 leakage about said bushing, packing in said chamber about said tube, a gland for compressing said'packing about said tube, said gland having an axial passage communicating with said liquid supply passage, and an 12o ejector nozzle communicating with said pressure fluid supplyv passage and extending into said axial chamber. g

4l. In a rock drill, the combination of a cylinder, an axially perforated piston working therein, a rear cylinder headv having pressure fluid and liquid supply passages, a fluid supp-ly tube extending into the axial perforation of the piston, a bushing in which said tube is supported, said bushing being ing vthereln, `a rear cylinderhead vhaving pressure fluidand liquid supply passages, a

fluid supplyttube. extending into the axial perforation lof. 4the piston, a` bushing' in which. said tube is supported, saidgbushing being mounted in said cylinder headrand having an `axial chamber; two packing washers in said chamber about said tube, a flange interposedbetween said washers, said tube having means for fixedly securing said flange thereto, a gland for compressing said washers, said bushing havinga passage ,or passages communicating with said liquid supply passage andsaid tube, and means communicating with said pressure fluid supply passage ,for delivering pressure fluid to said tube.

6. In a rock drill, the-.combination of a cylinder, an axially perforated piston working therein,- a rear cylinder head having pressure fluid and liquid supply passages, a

fluid supply tube extending into the axial perforation ofthe piston, a 'bushing in which said tube is supported, said bushing being threaded into said cylinder head and having an axial chamber, gpacking in said chamber about saidtube, a gland threaded into said bushing for compressing said packing, said gland having an axial passage communicating with said liquid, supply passage, and an ejector nozzle communicating with said pressure fluid supply passage and extending into said axial chamber.

7. In a rock drill, the combination of a cylinder, an axially perforated piston working therein, a rear cylinder head having pressure fluid and liquid supply passages, a fluid supply tube extending into the axial perforation of the piston, a bushing in which said tube is supported, said bushing being mounted in said cylinder head and having -an axial Qchamber, packing in said chamber about said tube, a gland for compressing said packing, said gland having an axial passage communicating with said liquid supply passage, and an ejectornozzle threaded into the rear end 0f said bushing communicating with said pressure fluid supply passage and extending into saidgaxial chamber. f.

8. In aV rock drill, the combination of a cylinder, an axially perforated piston working therein, a rear .cylinder head having 'pressure fluid and liquid supplychambers,

a fluid supply tube extendingl into the axial vperforation `of the piston, a bushing in which .i said tube lis supported, said bushing beinglmountedin said cylinder and Vhaving a passage'communicating with said pressure fluid supply chamber and a passage or passages communicating With said liquid sup- ,ply chamber and with said tube, and means forl delivering pressure fluid from said pressure fluid supply chamber to said fluid supply'tube. x 4 e 9. In arockdrill, the combination of a cylinder, an axially perforated', piston working therein, a Vrear cylinder head having pressure fluid and liquid supply chambers, a fluid supply tube extending into the axial perforation of the piston, a bushing in which said tube isy supported, said bushing being mounted` in saidcylinder and having a passage communicating with said pressure fluid supply chamber and a passage or passages communicating with said liquid supply chamber, another bushing withinl the lirst and having an axial chamber communicating with said fluid supply tube Vand one or more passages leading fromlthe passage or passages in said bushing to said axial chamber, and means having `a passage leading from said'pressure fiuidsupply chamber and delivering fluid therefrom to said fluid supply tube.

j 10. In a rock drill, the combination of a cylinder, an axially perforatedN piston working therein, a controlling valve for controlling the distribution of pressure fluid to the cylinder, a valve casing having a pressure fluid supply space, two tubes, one receiving pressure fluid from said space and delivering pressure fluid in a'forward direction to the other tube, and the latter extending into the axial perforation of the piston and having its discharge at its forward end, and means for delivering liquid in a forward direction to the last-mentioned tube.

11. In a rock drill, in combination, ahead block, ak throat piece therein, a fluid supply tube having its end secured to said throat piece, and a nozzle secured in said throat piece and arranged with its end adjacent the end of said tube. .i

12. In a rock drill, in combination, a head block, a throat piece therein, means for supplying water to said throat piece, a fluid supply-tube having itsend secured to said throatrpiece, and an air nozzle secured in vsaid throat piece and arranged with its end 14. In a rock drill, in combination, a head block, a bushing therein, av fluid supply tube having its end within said bushing, packing surrounding said tube within said bushing,

a gland for compressing said packing and Y securing said tube in said bushing, anda nozle having its end adjacent the end of said tu e.

15. In a rock drill, in combination, a head block having a packing chamber, av fluid supply tube having its endextended Vinto said chamber, packing surrounding said tube, a combined gland and throat piece for compressing said packing, and a nozzle supported thereby with its end adjacent the end of said tube. f Y

16. In a rockl drill, in combination, a head block having a packing chamber, a fluid supply tube having a flanged end within said chamber, packing surrounding said tube, a glandfor compressing said packing and securing said tube in said chamber, and a nozzle;O having its end adjacent the end of said tu e.

17. A rock drill comprising, in combination, a cylinder having a rear cylinder head,

ra piston working in said cylinder, a conduit supported in said cylinder head and extending into said piston, said conduitfbeing provided with a reduced portion adjacent its rear end, a laterally projecting flange encirclingl said reduced portion, said conduit being provided with means for preventing longitudinal displacement of said flange on said conduit, and packing means engaging said flange. i

18. A rock drill comprising, in combination, a cylinder having a rear cylinder head, a piston Working in said cylinder, a conduit supported in said cylinder-head and extending into said piston, a laterally'projecting flange encircling said conduit, means on said conduit interlocked therewith, and packing means engaging said flange.

19. A rock drill comprising, in combination, a cylinder having a rear cylinder head, a piston working in said cylinder, a conduit supported in said cylinder'head and extending into said pistonsaid conduit being provided with two shoulders 'adjacent its rear end, a laterally projecting flange encircling said conduit and interposed between-said shoulders, and packing means engaging said flange.

20. VIn a rock drill, a cylinder vin cluding a Y rear'head having a Vfluid passage therein, a piston movable in 'said cylinder, a coaxially disposed removable plug attached' to said rear head, and afluid supply tube extending axially through said piston communicating with said passage and bodily 'removable `with said plug; 4 Y A 21. Inv a rock drill, a cylinder including a rear head having a plurality of fluid pas'- sages therein, a piston movable in said cylina fluid supply tube extending axially through "said Ipiston communicating with said passagesA and bodily removable ywith said plug. i 22. In a rock drill, a cylinder including.v a rear head having a fluid passage therein, a

'piston' movable in said cylinder, a coaxially disposed removable plug attached to said reanliead, a fluid supply tube `extending ax- Y ially through said piston communicating with said passage, and-means for removably attaching lsaid tube to said removable plug. 23. In a rock drill, arear head having gaseous Huid and liquid passages'therein, aY

plug rcarried in said head, a cooperating plug carried in said plug and having -a "chamber communicating with each of said passages, and a rflanged 'fluid vsupply tube communicating with said chamber and having its flange clamped between said'plugs.

24. In a rock drill, a cylinder including a rear head having a fluid passage therein, a piston movable in said cylinder, a plug threaded in said head, a iuid supply tube extending axially throughsaid piston and communicating with said passage, and'meansin- /cluding a coperating plug threaded to said first mentioned to the latter. Y

25. In arock drill, a rear head, a bushing carried thereby, a fluid supply tube carried by said bushing, means including'a coperating bushing bodily removable with said first mentioned bushing for clamping said tube to said first-mentioned bushing, and means forming a plurality of fluid passages communicating with said second mentioned Ybushing and said tube.v

v26. a rock drill, the combination of a cylinder, an axially perforated piston Vworking therein, a rear cylinder head having pressure fluid and liquid supply passages, a hollow member disposed in said cylinder head and having perforations extending through the side wall thereof for the transmission to the interior thereof of a supply of fluid, a tube having its rear end extending through into the forward end of said member and extendingthrough the perforation in said piston, and a separate tube communicating with a source of fluid supply engaging with the'rear end of said member and extending coaxially into said first mentioned tube.

27. In a rock drill, the combination of a cylinder, an axially perforated piston working therein, a rear cylinder head, a hollow member disposed in said rear cylinder head, a tube extending through the axial perforation in said piston and terminating at its rear end in the forward end of said hollow cylindrical member, the sides of said hollow cylindrical member beingperforated for the supply of pressure fluid to the interior thereof Aand to said tube, and a tubular member for the supplyy of another iuidl projecting plug for attachingsaid tube into said member and arranged coaxially with said tube, said last mentioned member being fixed in position by the rear end of said hollow member.

28. In a rock drill, the combination with a hollow drill steel, of a cylinder, a rear head therefor, an axially perforated piston working therein, a bore in said rear cylinder head extending longitudinally thereof, a tube extending from said bore through the axial perforation in said piston, a Vhollow v member having peripheral perforations for the supply to the interior thereof of fluid, said tube terminating within the forward end of said member, and said member being operative to maintain said tube in rigid relation to said head, and a second member projecting forwardly through the rear end of said hollow member for supplying a second fluid for delivery to said hollow steel and having its position xed by engagement with said member. p

29. In a rock drill, a rear head, a bushing carried thereby, a fluid supply tube disposed in the bushing, a coperating hollow bushing threaded into the first mentioned bushing and clamping the tube thereto, a nozzle disposed coaxially with the tube and projecting into the hollow bushing, and means forming passages communicating with the interior of said hollow bushing and with said nozzle.

30. The combination with a percussive tool, of a hollow drill steel, and means for supplying a cleansing fluid thereto comprising a rear head, a gland therein having a socket formed therein, a plurality of tubes detachably secured in said socket, and means for conducting fluid to said tubes.

31. The combination with a percussive tool, a hollow drill steel and. means for supplying cleansing fluid thereto comprising a rear head, a gland therein having a socket, a plurality of tubes mounted in said head, means operative to maintain said tubes in spaced relation disposed in said socket, and a packing compressed upon movement of said gland.

In testimony whereof, I have signed my name to this specification, in the presencefof two subscribing witnesses.

GEORGE H. GILMAN.

Witnesses: SARAH B. Frrorr, E. A. TRACEY. 

